Browse free open source VoIP software and projects below. Use the toggles on the left to filter open source VoIP software by OS, license, language, programming language, and project status.
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Issabel PBX - Unified Communications
Unified Communications Server
A simple noise gate app intended for use with VOIPs like Skype.
Java wrapper for the popular chat & VOIP service
http://www.vaakpbx.com
OpenSource Call Center and Dialer System
Browse over Tor/i2p, Anon p2p Chat/FileTx, p2p ConfVideoVoIP
High performance, production quality STUN server and client library
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.
Positional Audio Communication for Minecraft with Mumble
SIP Video Multiconference Media Server with WebRTC support.
Callflow Sequence Diagram Generator
Java VoIP Softphone (SIP) (replaced by jfPhone)